飞灰残炭对零价汞蒸汽的吸附特征  

Elemental Mercury Adsorption by Residual Carbon Separated from Fly Ash

作　　者：王立刚[1] 陈昌和[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]清华大学煤的清洁燃烧技术国家重点实验室,北京100084

出　　处：《北京科技大学学报》2004年第4期353-356,共4页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金(No.50306010);国家重点基础研究基金(973计划)资助项目(NO.G1999022200)

摘　　要：研究了飞灰未燃残炭对零价汞蒸气的吸附特性.在低汞平衡浓度(<250μg/m3)条件下,残炭汞吸附能力与商业活性炭差距不显著,而商业活性炭在高汞浓度端的汞吸附量则明显升高.残炭汞吸附特性与其来源相关性较强.残炭的吸附等温线类似于Ⅱ型等温线,而商业活性炭则明显具有Ⅲ型吸附等温线特征.静态吸附实验结果表明炭质吸附剂表面存在活性点位,从而使其吸附过程得到加强.因为残炭制造成本相对低廉,所以在烟气汞污染物脱除方面更具有价格优势.The adsorption capacity for vapor-phase elemental mercury (Hg0) of residual carbon separated from fly ash was investigated in an attempt for the control of elemental mercury emissions from combustion processes. At low mercury concentrations (3), the adsorption capacity difference of residual carbon to commercial activated carbon is not significantly, but the mercury sorption capacity of commercial activated carbon increase significantly at high mercury concentrations. The mercury sorption capacity of residual carbon was also found to be source dependent. The isotherms of residual carbon were similar to those classified as Type II with distinctness different in concave. But commercial activated carbon was more like those classified as Type III. Static experiments reveal that prime sites which enhance the mercury adsorption exist in the surface of carbon. Due to the relatively low production costs, these residual carbons would likely be considerably more cost-effective for the removing of mercury from combustion flue gases than other technologies.

关 键 词：汞 吸附 残炭 飞灰 活性炭 

分 类 号：X701[环境科学与工程—环境工程]